Engine Cooling Symptom Diagnosis

WARNING: This page is about a different variant/trim than selected.

POSSIBLE CAUSE REFERENCE

Condition	Possible Cause	Action
Engine overheats (Radiator fan operates)	Loose or broken accessory drive belt	Adjust or replace accessory drive belt. See ACCESSORY DRIVE BELT TENSION INSPECTION .
	Not enough coolant	Check coolant level and add as necessary. See COOLANT LEVEL CHECK .
	Faulty thermostat	Replace thermostat assembly. See THERMOSTAT ASSEMBLY INSPECTION .
	Faulty water pump	Replace water pump. See WATER PUMP INSPECTION .
	Dirty or bent radiator fins	Clean or repair. RADIATOR ON-VEHICLE INSPECTION AND CLEANING .
	Coolant leakage on cooling system	Repair cooling system. See ENGINE COOLING SYSTEM INSPECTION AND CLEANING .
	Clogged radiator	Check and replace radiator as necessary. See RADIATOR REMOVAL AND INSTALLATION .
	Faulty radiator cap	Check radiator cap. See ENGINE COOLING SYSTEM INSPECTION AND CLEANING .
	Dragging brakes	Adjust brake. See BRAKES SYMPTOM DIAGNOSIS .
	Poorly charged battery	Check and replace battery as necessary. See BATTERY INSPECTION .
	Poor electricity generation by generator	Check and repair generator as necessary. See GENERATOR SYMPTOM DIAGNOSIS .
	ECT sensor faulty	Check and replace ECT sensor as necessary. See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION .
	Radiator cooling fan motor faulty	Check and replace radiator cooling fan motor as necessary. See RADIATOR COOLING FAN ASSEMBLY ON-VEHICLE INSPECTION .
	ECM faulty	Check and replace ECM as necessary. See INSPECTION OF ECM AND ITS CIRCUITS .
	Wiring or grounding faulty	Repair as necessary .
	Too much additional electrical equipment	Dismount necessary pieces of equipment .
Engine overheats (Radiator fan does not operate)	Fuse blown	Check and replace fuse .
	Radiator cooling fan relay faulty	Check and replace radiator cooling fan relay as necessary. See RADIATOR COOLING FAN RELAY INSPECTION .
	ECT sensor faulty	Check and replace ECT sensor as necessary. See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION .
	Radiator cooling fan motor faulty	Check and replace radiator cooling fan motor as necessary. See RADIATOR COOLING FAN ASSEMBLY ON-VEHICLE INSPECTION .
	Wiring or grounding faulty	Repair as necessary .
	ECM faulty	Check and replace ECM as necessary. See INSPECTION OF ECM AND ITS CIRCUITS .